When building an installer on windows, if I use:
--app-version 13-EA
then when building the msi installer I get the error message:

Bundler MSI Installer skipped because of a configuration problem: Version string is not compatible with MSI rules [13.EA].
Advice to fix: Set the bundler argument "win.msi.productVersion" according to these rules: http://msdn.microsoft.com/en-us/library/aa370859%28v=VS.85%29.aspx

when using the same think on the EXE instllar type I get

java.io.IOException: Exec failed with code 2 command [[C:\program files (x86)\Inno Setup 5\iscc.exe,
with --verbose it will tell me that line 11 of .iss file is invalid.

The point is, WinMsiBundler checks the version first and gives us a nice message but WinExeBundler does not. Just uses it and gets an error.